A server is configured for preventing flood attacks by a client having sent a request, by dynamically generating a challenge to be performed by the client before the server will perform any work for the client. The silicon submount photodiode chip 11 receives a light beam radiated from a back side 13b of the red color laser diode 13 for monitoring an output of a light beam radiated from a front side 13a of the red color laser diode 13. The microstructure specimens are transferred throughout by a robotic manipulator arm providing greater precision and speed and serial-sectioning process control software provides control. In addition, first and second control circuits can be provided for controlling the pump motor without using a processor.